linux-kernel - Re: [PATCH 07/11] Memory compaction core

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Message-ID: <28c262361003231847q1e4b7c7agdf82c4b2e920ada4@mail.gmail.com>
Date:	Wed, 24 Mar 2010 10:47:41 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Mel Gorman <mel@....ul.ie>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Adam Litke <agl@...ibm.com>, Avi Kivity <avi@...hat.com>,
	David Rientjes <rientjes@...gle.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Rik van Riel <riel@...hat.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH 07/11] Memory compaction core

On Wed, Mar 24, 2010 at 10:03 AM, KAMEZAWA Hiroyuki
<kamezawa.hiroyu@...fujitsu.com> wrote:
> On Tue, 23 Mar 2010 12:25:42 +0000
> Mel Gorman <mel@....ul.ie> wrote:
>
>> This patch is the core of a mechanism which compacts memory in a zone by
>> relocating movable pages towards the end of the zone.
>>
>> A single compaction run involves a migration scanner and a free scanner.
>> Both scanners operate on pageblock-sized areas in the zone. The migration
>> scanner starts at the bottom of the zone and searches for all movable pages
>> within each area, isolating them onto a private list called migratelist.
>> The free scanner starts at the top of the zone and searches for suitable
>> areas and consumes the free pages within making them available for the
>> migration scanner. The pages isolated for migration are then migrated to
>> the newly isolated free pages.
>>
>> Signed-off-by: Mel Gorman <mel@....ul.ie>
>> Acked-by: Rik van Riel <riel@...hat.com>
>> Reviewed-by: Minchan Kim <minchan.kim@...il.com>
>
> I think lru_add_drain() or lru_add_drain_all() should be called somewhere
> when we do __isolate_lru_page(). But it's (_all is) slow....
>

migrate_prep does it.

-- 
Kind regards,
Minchan Kim
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